5.11 S: Functions for Textile Applications
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 223
Synchronous Accel/Decel (KEB 2)
Synchronous KEB can be used when multiple drives have to be decelerated during power loss while keeping the speed
ratio between the drives constant.
KEB 2 begins when one of the conditions that triggers the KEB function becomes true. To have multiple drives remain in
sync with one another while accelerating and decelerating during KEB 2, Yaskawa recommends setting a multi-function
input to "KEB 1" (H1- = 65 or 66) to activate the synchronous accel/decel provided by KEB 2.
KEB 2 decelerates the drive using the deceleration time set in S5-01 and S5-02. This deceleration time is referred as the
time needed to decelerate from the active frequency reference to stop.
When the power returns the drive accelerates back to the frequency reference using the time set in S5-05. This
acceleration time is referred as the time needed to accelerate from the current output frequency to the frequency
reference.
Figure 5.77
Figure 5.77 S4-01 = 2 (Synchronous accel/decel (KEB 2))
Figure 5.78 shows a wiring diagram when assigning an input terminal to trigger KEB 1 (H1- = 65 or 66).
Figure 5.78
Figure 5.78 KEB Terminal Wiring Example
Note: 1. Make sure that the Run command remains enabled during power loss. If the Run command is released, then the drive will not be able
to accelerate back up to the frequency reference once power is restored.
2. A braking resistor option is needed when using the synchronous accel/decel feature offered by KEB 2 (S4-01 = 1) while S5-10 is set
to 0.
H1-
= 65
(KEB 1)
Drive 1,
Output Frequency
Drive 2,
Output Frequency
Drive 3,
Output Frequency
0 Hz
OFF OFF
ON
Power Loss Power Restored
S5-05 (KEB 1 Synchronous
Acceleration Time)
S5-01 (KEB Decel Time 1)
S5-02 (KEB Decel Time 2)
M
UV Detection
Relay
R/L1
S/L2
T/L3
S6 - KEB 1, 2
S1 - Run Command
SC
U/T1
V/T2
W/T3
B1 B2
L1
L2
L3
Braking Resistor
Option
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